Raoul Dufy (1877 – 1953) was a French Fauvist painter. He developed a colorful, decorative style that became fashionable for designs of ceramics and textiles, as well as decorative schemes for public buildings.
This stamp was issued in France, engraving by Pierre Gandon. There were 7,275 of these stamps issued between November 1965 and September 1966.
Another painting shows the same subject, but was not made into a stamp as far as I know.